161 Athor

161 Athor is an M-type Main belt asteroid that was discovered by James Craig Watson on April 19, 1876, at the Detroit Observatory[1] and named after Hathor, an Egyptian fertility goddess. An occultation by Athor was observed, on October 15, 2002, resulting in an estimated diameter of 47.0 kilometres (29.2 mi).[7]

161 Athor
A three-dimensional model of 161 Athor based on its light curve.
Discovery[1]
Discovered byJames Craig Watson
Discovery siteDetroit Observatory
Discovery date19 April 1876
Designations
(161) Athor
Pronunciation/ˈæθər/,[2] /ˈɑːθər/[3]
Named after
Hathor
Main belt[4]
Orbital characteristics[4][5]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc116.50 yr (42551 d)
Aphelion2.70593 AU (404.801 Gm)
Perihelion2.05285 AU (307.102 Gm)
2.37939 AU (355.952 Gm)
Eccentricity0.137237
3.67 yr (1340.6 d)
348.807°
0° 16m 6.737s / day
Inclination9.05986°
18.6090°
295.007°
Physical characteristics
Dimensions44.19±3.3 km[4]
Mean diameter[6]
47.0±0.2 km
circular fit[7]
7.280 h (0.3033 d)[4]
7.281 ± 0.001 hours[8]
7.288 ± 0.007 hours[9]
0.1980±0.033[4][6]
M[10]
9.15[4][11]

    Photometric observations of the minor planet in 2010 gave a rotation period of 7.2798±0.0001 h with an amplitude of 0.19±0.02 in magnitude. This result is consistent with previous determinations.[12] The spectra is similar to that of carbonaceous chondrites, with characteristics of ferric oxides and little or no hydrated minerals.[13]

    References
    1. "Discovery Circumstances: Numbered Minor Planets (1)-(5000)". IAU: Minor Planet Center. Archived from the original on 2 February 2009. Retrieved 20 December 2008.
    2. Noah Webster (1884) A Practical Dictionary of the English Language
    3. "Hathor, Athor". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)
    4. "161 Athor". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.
    5. "(161) Athor". AstDyS. Italy: University of Pisa. Retrieved 20 December 2008.
    6. Tedesco; et al. (2004). "Supplemental IRAS Minor Planet Survey (SIMPS)". IRAS-A-FPA-3-RDR-IMPS-V6.0. Planetary Data System. Archived from the original on August 17, 2009. Retrieved December 27, 2008.
    7. Dunham & Herald (2008). "Asteroid Occultations". EAR-A-3-RDR-OCCULTATIONS-V6.0. Planetary Data System. Retrieved 27 December 2008.
    8. Pilcher & Higgins (2008). "Period Determination for 161 Athor". The Minor Planet Bulletin. 35 (4): 147. Bibcode:2008MPBu...35..147P.
    9. Debehogne & Zappala (1980). "Photoelectric lightcurves of the asteroids 139 Juewa and 161 Athor, obtained with the 50 CM photometric telescope at ESO, La Silla". Astronomy and Astrophysics Supplement Series. 42: 85–89. Bibcode:1980A&AS...42...85D.
    10. Neese (2005). "Asteroid Taxonomy". EAR-A-5-DDR-TAXONOMY-V5.0. Planetary Data System. Archived from the original on August 5, 2009. Retrieved December 27, 2008.
    11. Tholen (2007). "Asteroid Absolute Magnitudes". EAR-A-5-DDR-ASTERMAG-V11.0. Planetary Data System. Archived from the original on August 16, 2009. Retrieved December 27, 2008.
    12. Pilcher, Frederick (July 2011), "Rotation Period Determinations for 28 Bellona, 81 Terpsichore, 126 Velleda 150 Nuwa, 161 Athor, 419 Aurelia, and 632 Pyrrha", The Minor Planet Bulletin, 38 (3): 156−158, Bibcode:2011MPBu...38..156P.
    13. Busarev, V. V.; Taran, M. N. (November 2002), "On the spectral similarity of carbonaceous chondrites and some hydrated and oxidized asteroids", Proceedings of Asteroids, Comets, Meteors - ACM 2002. International Conference, 29 July - 2 August 2002, Berlin, Germany. Ed. Barbara Warmbein. ESA SP-500., Noordwijk, Netherlands: ESA Publications Division, pp. 933−936, Bibcode:2002ESASP.500..933B, ISBN 92-9092-810-7.


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